All of the Candy Crush levels (ATM 830 regular and 560 dreamworld levels) are fairly easy to get three stars on without boosters, extra moves or other help; all except level 734 which requires at least 200 times as many tries on average than the second hardest. I can't find anyone that has done 734, with 3 stars and no boosters, on youtube or elsewhere.
When you try 734 you also notice that there is a problem with the random generator. Boards and candy sequences repeat exactly. Presumably the random generator is okay but the seed handling is faulty. You need to seed just once and with a unique seed, e.g. a timestamp.
Can you please fix these two bugs?